Objective: Computer-aided design/computer-aided manufacturing (CAD/CAM) system is the most popular technology producing ceramics and has become increasingly popular in dentistry. The aim of present study was to investigate the color effect of 4 different colors of resin cements and stainability effect of hot coffee on final color of glass ceramic CAD/CAM blocks.

Methods: Two different color of a CAD/CAM restorative material (Cerec blocs PC, Sirona) in 1 mm thickness with four different color of a dual-curing resin cement (Variolink N; Ivoclar Vivadent) in 0.5 mm thickness were tested in this study (n=5). After cementation specimens were divided into two groups for thermocycling half of them with coffee and the others without coffee. First spectrophotometric measurement was applied after cementation and the second measurement was done after thermocycling. Datas were analysed by SPSS software (IBM Corparation, Armonk, New York, United States) for the analysis and p<0.05 was accepted as significant.

Results: The color of resin cement did not effect the final color glass ceramic (GC) restoration statistically. Statistically significant differences were found in white, transparant and yellow colors of resin cement after thermocycling with/without hot coffee.

Conclusion: The esthetic achievement of porcelain laminates can be affected by the color of the resin cements. 1mm thickness of GC was not effected only resin cement color after cementation. The color of resin cements can change during as long as it is used.